Archived posting to the Leica Users Group, 1997/09/23

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: Re: 90/2.8 -- internal reflections
From: Alfred Breull <puma@hannover.sgh-net.de>
Date: Tue, 23 Sep 1997 14:16:29 +0200

At Sept. 22 Charlie wrote:

<<< I have a 90/2.8 that I bought new in Jan. of '97. 

I've used it a couple of times to take long exposure photos of the full
moon lighting clouds. On both occasions the lens produced a spot in each
frame that I attribute to an internal reflection of the moon's disc. The
hood was extended, no filters were in place, and the glass was clean. I can
see no flaws in the coatings. I can see no obvious defects looking through
the glass into the barrel. The internal reflections appeared first on color
print film and then on Kodachrome--they aren't coming from some trick of
processing. I haven't noticed my Canadian 35 Summicron doing this. >>>


Although not with the 2.8/90, I covered the recent eclipse of the moon with
the (old) 4/ 200 Nikkor AI, the 2.8/ 120 mm Biometar (MF), and the 2.8/80
Planar (MF) at max opening and 10 to 15 sec (E100s). There are no
reflections, neither in the pix of the full moon, nor in the diamond ring,
or even in several severely overexposed slides (40 to 50 sec).

I'm afraid, it's something with your 2.8/90. 

Alf